Jobs Java

About B2Spin

We are B2Spin, and we are dedicated to delivering the best Free-to-Play Social Casino and gaming experiences by creating captivating, engaging, and unique products that are accessible to everyone. We have built a team of talented professionals from all over the globe, who are working to continually improve the experiences of our players. We are not looking to just be part of the industry, but to revolutionize it.

AI-Driven Engineering Culture

We are actively building an AI-driven engineering organization with a clear and deliberate stance: artificial intelligence is a core part of how we build and deliver software — not an experiment, not a trend, and not an optional add-on.

AI is embedded into our engineering workflows, from system design and prototyping to refactoring, testing, and code review. We expect engineers to be fully comfortable working in AI-driven environments and to treat AI as a primary productivity multiplier. Strong engineering judgment, architectural ownership, and accountability remain essential—AI amplifies our engineers, it doesn’t replace responsibility for technical decisions.

What you will be doing
• Design, evolve, and maintain core libraries, framework extensions, and shared components used across all engineering teams
• Take ownership of system performance, scalability, and high-load architecture, ensuring core services can handle massive throughput with low latency
• Proactively monitor production behavior, investigate complex application/database performance bottlenecks, and introduce advanced metrics, dashboards, and alerting systems
• Establish and advocate for best practices in concurrency, memory management, and resource utilization across the backend ecosystem
• Collaborate with cross-functional teams including backend, web, mobile, QA, and product teams
• Take ownership of specific functional areas within our large-scale architecture
• Leverage AI tools and assistants as integral parts of your development workflow—from system design to code review
• Contribute to maintaining high test coverage, predictable production behavior, and seamless scalability
• Drive engineering excellence through modern practices and continuous improvement

What we are looking for
• Deep, low-level understanding of Java internals (JVM, GC behavior, memory management, concurrency/multithreading, and performance profiling)
• Advanced knowledge of relational databases (PostgreSQL), including query optimization, indexing strategies, locking mechanisms, and connection pooling under heavy load and distributed systems architecture, specifically high-throughput event streaming with Kafka (partitioning, replication, consumer group rebalancing, and tuning).
• Strong system design, troubleshooting and debugging capabilities
• Comfortable and proactive in using AI coding assistants (GitHub Copilot, Claude Code, etc.) as productivity multipliers
• Practical experience validating, refining, and taking ownership of AI-generated output
• Upper-intermediate or higher level of English

Nice to have:
• Proven track record of building or maintaining shared libraries, SDKs, or internal tooling in a large-scale engineering organization.
• Hands-on experience with APM tools and observability stacks (Prometheus, Grafana, ELK) with the ability to define meaningful SLOs/SLIs, custom metrics, and proactive alerts.

Main technologies: Java, Spring, Spring Boot, Ebean-ORM, Quartz, Maven, Resteasy, Flyway, PostgreSQL 15, HTTP/Websockets, Netty, K8S/Docker, GCP, Jenkins, ELK, Grafana.

Numerical Technologies Ltd is a leading provider of custom software solutions and services specializing in risk, limits, and regulatory capital. Right now, we are looking for a Principal Java Engineer to join our team.

What you will be doing:

As part of the team, you will contribute to a strategic modernization initiative for a leading multinational financial services company. You will design, develop, and support scalable Java solutions while making key architectural decisions as the platform evolves from a monolithic application to a microservices architecture.

Working closely with product and engineering teams, you will design new service-based solutions, define service boundaries and integrations, build fault-tolerant services, and ensure high code quality through testing, code reviews, and system design.

Project: Modernization of a monolithic platform into a microservices architecture. Java services provide authentication, logging, and data management, while Python services implement core computational logic. The role combines hands-on development with architectural ownership of new solutions derived from existing business capabilities.

What we’re looking for:

• 5+ years of experience in Java development, preferably in FinTech.
• Strong experience with Java and Spring Framework.
• Solid understanding of microservices architecture and design patterns.
• Proficient in SQL (Oracle, PostgreSQL).
• AWS experience and Python knowledge are a plus.
• Ability to work independently and take ownership of technical and architectural decisions.
• Bachelor's degree or higher required.
• Upper-intermediate English level or higher.

What we offer:

• Competitive compensation depending on experience and skills.
• Regular assessments and salary reviews.
• Paid personal days.
• Mental health support program.
• Partial gym compensation.
• Language classes.
• Flexible working schedule.

Project Description:

One of the world's largest providers of products and services to the energy industry has a need to develop and support enterprise information system in Oil & Gas domain.

Product being developed is a cloud solution for interpretation of geological and geophysical data. Project is based on SCRUM methodology.

Our project is stable, long-term and constantly adopts new technologies such as newest Java and Eclipse RCP versions, cloud and GPU computing, microservices architecture and other innovative frameworks.

Work supposes close cooperation with Customer team located in Houston and following Agile principles.

Our team is senior, supportive and friendly.

Responsibilities:

• Collaborate closely with geophysicists, data scientists, and software engineers to translate scientific domain requirements into robust on-prem or Cloud software solutions.

• Design, develop, and maintain high-performance applications for geophysical and geological data analysis, interpretation and visualization

• Present architectural designs and technical proposals to the architecture review board.

• Ability to break down development tasks and lay out clear implementation roadmaps.

• Implement and optimize computation algorithms

• Design and develop both thin and thick client applications that interact with cloud-based microservices.

• Ensure high code quality through unit testing, code reviews, security hardening and continuous integration with other domain tools

• Provide technical support and lead user troubleshooting sessions to resolve issues and ensure smooth operation of DSG application.

• Mentor junior developers and actively contribute to architectural and

implementation decisions.

• Embrace Agile/Scrum methodologies, delivering and demonstrating working solutions at the end of each sprint

• Stay current with emerging technologies and trends in geophysical computing and software development.

Mandatory Skills Description:

At least 5-10 years of experience

GIS Java Eclipse

ESRI ArcGIS Runtime

ESRI Services and Authentication

Nice-to-Have Skills Description:

DSG experience

Oil and Gas experience is preferred but not mandatory

Languages:

English: B2 Upper Intermediate

PioGroup Software is a team of professionals passionate about building reliable digital products. We are looking for an experienced Strong Middle Blockchain Engineer with strong production experience working with the Bitcoin protocol and Bitcoin wallet/custody infrastructure.

The main focus of the role is developing and maintaining Bitcoin wallet infrastructure, including UTXO management, transaction construction and signing, PSBT, SegWit, multi-signature flows, fee management, and transaction lifecycle handling.

For this position, hands-on production experience specifically with the Bitcoin protocol is essential. General blockchain or Web3 experience alone is not sufficient.

Requirements

• 3+ years of production experience with Bitcoin / BTC infrastructure.
• Hands-on experience with Bitcoin-based protocols, UTXO model, PSBT, and BIP standards.
• Strong experience with Java, Spring Boot, and SQL.
• Experience working with production wallet or custody infrastructure.
• Good understanding of TDD and/or BDD practices.
• Familiarity with Domain-Driven Design principles.
• Experience working in a monorepo environment with shared libraries and coordinated CI/CD pipelines.
• Professional written and spoken English.
• Proactive communication and ability to raise blockers, technical concerns, and cross-team dependencies.

Bitcoin Protocol Expertise

We expect strong practical knowledge of:

• PSBT and BIP-174.
• UTXO management and coin selection.
• SegWit transaction structures.
• Bitcoin script types and descriptor formats.
• HD wallets and derivation paths.
• BIP-48 and BIP-67.
• P2WSH and multi-signature transaction flows.
• PSBT combination, signing, and finalisation.
• Witness data and BIP-143.
• DER signature encoding, low-S enforcement, and sighash types.
• UTXO indexing and balance calculation.
• Address discovery, gap limits, change address allocation, and address reuse prevention.

Transaction Lifecycle & Fee Management

Production experience with:

• Mempool monitoring.
• Fee estimation and fee-rate prediction.
• RBF (Replace-By-Fee).
• CPFP (Child-Pays-For-Parent).
• Stuck transaction detection.
• Transaction replacement and rebroadcasting.
• Confirmation monitoring.
• Double-spend detection.
• UTXO consolidation during low-fee periods.

Candidates should also clearly understand the operational difference between a transaction being:

• Broadcast.
• Accepted into the mempool.
• Confirmed.
• Confirmed at depth N.

A strong understanding of Bitcoin probabilistic finality, dust limits, fee spikes during network congestion, and the behaviour of unconfirmed transactions is also required.

Responsibilities

• Develop and maintain Bitcoin wallet infrastructure.
• Manage UTXOs and wallet balances.
• Construct Bitcoin transactions.
• Work with PSBT and SegWit.
• Implement multi-signature transaction flows.
• Handle fee estimation and fee bumping using RBF and CPFP.
• Monitor mempool activity and transaction lifecycle.
• Implement deposit detection and address-level balance monitoring.
• Support wallet recovery and descriptor-based address discovery.
• Participate in technical design and architecture decisions.
• Collaborate with other engineering squads and shared platform components.

Nice to Have

• Experience with multiple blockchain protocols.
• Experience with institutional-grade custody or wallet platforms.
• Experience working with systems processing high volumes of Bitcoin transactions.

Important: we are specifically looking for candidates with documented commercial experience working with the Bitcoin protocol, including UTXO management, PSBT, SegWit, BIP standards, and the Bitcoin transaction lifecycle. Testnet-only, personal wallet, or exclusively Ethereum/Web3 experience will not be sufficient for this role.

About Us

Smart Capital Center is an end-to-end, AI-powered platform for Commercial Real Estate (CRE) investment and financial management. We power real-time underwriting, asset management, and portfolio analytics through a combination of live data, workflow automation, and AI-driven insights.

Operating at the intersection of Generative AI, finance, and real estate, we are building systems that digitize and simplify complex financial workflows.

Our clients include leading institutions such as JLL, Pacific Life Insurance Company, and KeyBank. We are a lean, high-performance team building category-defining technology in a $17 trillion industry.

To learn more about our platform and vision, please visit our website.

The Role

We are looking for a Backend Software Engineer with strong experience in building scalable systems and a deep interest in AI-powered applications.

This is a high-impact, hands-on role where you will design and build backend services, integrate AI capabilities, and develop intelligent, agent-driven workflows used in real-world production environments.

You will work closely with product, AI, and engineering teams to deliver reliable, high-performance systems and automation features.

What You Will Do

Backend Development

• Design, build, and maintain backend services using Java (Spring Boot) and Python
• Develop scalable APIs and microservices for data-intensive applications
• Optimize system performance, reliability, and scalability
• Design efficient data models and handle complex integrations

AI & Intelligent Systems

• Implement and integrate AI-powered features into core products
• Design and build agent-based workflows for automation and decision-making
• Apply prompt engineering techniques to improve LLM outputs and behavior
• Work with modern AI frameworks to productionize intelligent systems

Cloud & Infrastructure

• Develop and deploy backend systems on AWS (EC2, S3, RDS, Lambda, etc.)
• Build resilient, scalable cloud-native services
• Contribute to system monitoring, logging, and reliability

System Design & Engineering Excellence

• Contribute to architecture, service boundaries, and system design decisions
• Write clean, maintainable, and well-documented code
• Ensure security, performance, and operational stability
• Continuously improve engineering quality and development practices

Collaboration

• Work closely with frontend, product, and AI teams
• Contribute to end-to-end feature delivery
• Participate in Agile development processes

Requirements

• 5+ years of backend software development experience
• Strong experience building and scaling backend systems in production

Core Technical Skills

• Strong experience with Java and Spring Boot
• Solid experience with Python
• Strong knowledge of SQL and database design (PostgreSQL preferred)
• Experience building REST APIs, microservices, and distributed systems
• Hands-on experience with AWS (EC2, S3, RDS, Lambda, etc.)
• Proficiency with Git and modern development workflows

AI & Modern Development Experience

• Experience with prompt engineering for LLM-based systems
• Practical experience building AI agent workflows in production
• Familiarity with frameworks/tools such as:
  • LangGraph
  • LangChain
  • LangSmith
  • or similar ecosystems
• Experience using AI-assisted development tools, such as:
  • Claude Code
  • Codex
  • OpenCode
  • or similar

Nice to Have

• Experience with vector databases or semantic search (e.g., Milvus)
• Knowledge of RAG (Retrieval-Augmented Generation) architectures
• Experience with CI/CD pipelines and DevOps practices
• Familiarity with event-driven architecture

• Experience with data processing pipelines or document AI systems

   

Why Join Us

• Work on cutting-edge AI-powered systems in a $17T industry
• Build real-world applications using LLMs, agents, and automation
• High ownership and autonomy with meaningful technical impact
• Opportunity to influence system design and engineering direction
• Fast-moving, execution-focused team with minimal bureaucracy
• Competitive compensation and flexible work environment

About Our Client

Our client is a leading enterprise data platform company building an open, high-performance data lakehouse for AI and analytical workloads. The platform combines an intelligent SQL query engine, an AI-ready semantic layer, and an open catalog built on Apache Iceberg — enabling Fortune 500 companies across finance, energy, manufacturing, and logistics to unify, query, and govern data at massive scale across cloud and on-premise sources.

About the Role

We are looking for a Senior Software Engineer for the data catalog and enterprise data management layer of a large-scale lakehouse platform — the services that automate data ingestion and autonomously optimize Apache Iceberg tables. You will own features through the full development cycle, from design through deployment, in a multithreaded, distributed environment where scalability, performance, and always-on availability are the baseline expectations.

This is a systems-level, backend engineering role focused on data infrastructure internals — not application development or CRUD services.

Responsibilities

• Own the full software development cycle — inception, design, development, testing, deployment — for catalog and data-management services
• Build and operate services for automated ingestion and autonomous optimization of Apache Iceberg tables
• Reason about concurrency and parallelization to deliver scalability and performance in multithreaded, distributed systems
• Drive performance tuning and system-efficiency improvements
• Work with Apache Foundation open-source projects, contributing upstream where agreed
• Participate in code and design reviews, upholding a high engineering bar
• Collaborate with product managers, support teams, and solution architects on feature requests and design updates
• Partner with US-based engineering leads on technical decisions

Required Qualifications

• B.S., M.S., or PhD in Computer Science or a related field
• 5+ years of software engineering experience, preferably focused on database systems or related fields
• Strong object-oriented programming skills in Java or C++
• Solid grounding in data structures and algorithms
• Hands-on experience with multithreaded and asynchronous programming patterns for scalable, performant systems
• A passion for engineering quality — zero-downtime upgrades, availability, resiliency, and uptime as first-class concerns
• Comfort with a fast-moving environment; strong ownership; the confidence to defend a technical position and the openness to be mentored
• Comfortable with AI-assisted development workflows — using modern AI tools productively while critically validating their output
• English Upper-Intermediate or higher (B2+) — daily written and verbal communication with a US-based engineering team
• Availability to work EU business hours shifted 2–3 hours later for daily overlap with US West Coast mornings

Desired Skills

• Database internals and query planning
• Distributed systems: concurrency control, data replication, storage systems
• Apache Iceberg or other open table formats (Delta Lake, Hudi)
• Messaging systems: Kafka, NATS, or cloud pub/sub services
• Contributions to open-source data infrastructure (Apache projects especially valued)

Details

• Engagement: Long-term contract
• Location: Europe (EU / EEA / UK), remote
• Working hours: EU business hours, shifted 2–3 hours later for daily overlap with the US West Coast team

Job Description

• 5 or more years relevant work experience with BS, or 3 or more years or relevant work experience with MS Degree in Computer Science, Electrical Engineering or related field
• Experience across full software development life-cycle including design, requirements, implementation, andtest
• Java, JavaScript/TypeScript and script programming languages
• Strong development skills with databases and SQLs
• Practical experience working within an Agile/Scrum based environment
• Familiar with AWS services for example S3, ECS, EKS, MSK, VPC, RDS, etc
• Knowledge of Kafka

Job Responsibilities

• Designs, develops, debugs, modifies, tests software programs using Java, Scripting and other current programming languages, methodologies and technologies.
• Perform hands-on Java Development, adoption of modern software engineering & delivery practices using Java, Spring Boot REST/Microservices, AWS.
• Documents software development and/or test development by writing documents, reports, memos, change requests. Methods used are determined by approved procedures and standards
• Tracks software development effort by creating and maintaining records in the approved tracking
  management tool.
• Solves engineering problems by analyzing the situation and recommending corrective or alternative actions.
• Analyzes, evaluates, verifies requirements, software and systems by using software engineering practices.
• Investigates, researches, selects software designs, operating systems and/or practices.
• Continuously improves process and work methodologies by interfacing with peers/cross-functional groups and analyzing activities to improve workflow and work processes.
• Directs support personnel and project activities.
• In all actions, demonstrates a primary commitment to patient safety and product quality by maintaining compliance to the Quality Policy and all other documented quality processes and procedures.
• Represents organization as a prime contact on contracts or projects. Uses discretion, diplomacy, and tact to
  resolve difficult situations. May escalate serious issues to manager.
• Participates in the development of less experienced staff by setting an example, providing guidance, and
  offering counsel.

Department/Project Description

Our customer is an American manufacturer and globally recognized leader in Healthcare and Medical Devices. In close cooperation with the international team you will have the ability to participate in product feature definition, development, testing, and post-release support for innovative medical products.

Blackthorn Vision is seeking a Middle Strong/Senior Backend Developer (Java) for an outstaff project with a global leader in energy technology. Founded in 1926 and headquartered in Houston, Texas, the company has 100,000 employees serving customers in more than 120 countries and develops software solutions for automation across the energy and industrial sectors.

You will work as part of an international team, collaborating with Blackthorn Vision specialists, client-side engineers, and management. We are looking for a self-driven team player with strong problem-solving skills, a commitment to quality, and a passion for delivering robust and maintainable software solutions. Upper-Intermediate English or higher is required for effective day-to-day communication. The position follows a regular full-time working schedule aligned with the Ukrainian time zone.

In this role, you will build and support backend services that process operational and time-series data and deliver reliable APIs and event-driven solutions. You will work with technologies such as Kafka, Azure IoT Hub, RabbitMQ, Redis, Kubernetes, and Microsoft Azure to develop high-performance, resilient, and scalable applications.

Required Qualifications:

• 4+ years of professional software development experience.
• Strong hands-on experience with Java, Spring Framework, and Spring Boot.
• Basic experience with Node.js and TypeScript.
• Experience with Microservices Architecture, Event-Driven Architecture, and REST APIs.
• Strong understanding of system architecture and business requirements.
• Hands-on experience with Kafka and RabbitMQ.
• Experience with PostgreSQL, Cassandra, Redis, or similar relational/NoSQL databases.
• Experience with Docker, Kubernetes, Microsoft Azure, and Azure IoT Hub.
• Experience with CI/CD, DevOps practices, and modern observability tools.
• Experience using AI-assisted development tools such as GitHub Copilot, Microsoft Copilot, Cursor, or similar.
• Excellent problem-solving, communication, and collaboration skills.

Nice to have:

• Experience working with operational and time-series data.
• Bachelor’s degree in Computer Science, Software Engineering, Information Technology, or a related field.

Please note: We are open to considering candidates based abroad; however, cooperation is available only under Ukrainian contracting arrangements.

• You will join a Regulatory Reporting Platform within a large US investment bank. The platform is responsible for collecting, processing, and transforming large volumes of data from multiple internal systems to produce regulatory reports for 240 jurisdictions worldwide. In total, the platform supports around 10,000 reports across a wide range of regulatory, compliance, financial, and risk reporting areas.
  This is a large-scale, business-critical data platform operating in a highly regulated environment, where data accuracy, quality, traceability, and timely delivery are essential. The team works on building and enhancing data pipelines, implementing reporting logic, ensuring data validation and reconciliation, and supporting the generation of complex regulatory outputs.
  The project is delivered by a global distributed team with colleagues located in Ukraine, Poland, and the US, offering close collaboration with engineers, analysts, and business stakeholders across multiple regions.

   

• Responsibilities:

  - Design, develop, and maintain solutions for a large-scale Regulatory Reporting Platform
  - Build and enhance data processing pipelines using Java and Apache Spark
  - Implement scalable logic for data ingestion, transformation, aggregation, and enrichment from multiple internal data sources
  - Develop and optimize batch processing jobs to support the generation of regulatory reports across multiple jurisdictions
  - Ensure high standards of data quality, validation, reconciliation, and consistency throughout the reporting lifecycle
  - Translate business and regulatory requirements into robust technical solutions
  - Collaborate with business analysts, QA engineers, and cross-functional teams to deliver reporting functionality
  - Investigate and resolve data and application issues in development, test, and production environments
  - Improve application performance, scalability, and reliability for high-volume data processing workloads
  - Contribute to the design and implementation of reusable components and engineering best practices
  - Participate in code reviews, testing, and release activities to ensure high-quality deliverables
  - Work closely with distributed teams across Ukraine, Poland, and the US in an agile delivery model
  - Support continuous improvement of the platform, including monitoring, troubleshooting, and operational stability

   

• Mandatory Skills Description:

  - 6+ years of commercial experience with Java
  - Experience in designing and developing scalable, high-performance backend applications
  - Good knowledge of SQL and working with large datasets from multiple data sources
  - Strong problem-solving skills and ability to work effectively in a global distributed team

   

• Nice-to-Have Skills Description:

  - Experience in financial services, investment banking, or regulatory reporting projects
  - Familiarity with data quality, reconciliation, and control frameworks
  - Experience working with large-scale enterprise data platforms
  - Knowledge of cloud environments and modern data platform architectures
  - Understanding of CI/CD practices and automated deployment pipelines
  - Experience working in Agile / Scrum teams within a distributed global setup

   

• Languages:
  • English: B2 Upper Intermediate

Company Description
 

Join Sigma Software as a Principal Software Engineer and help shape secure, large-scale digital platforms for Public Sector initiatives. This is a strategic senior-level role for an experienced engineering leader who can combine hands-on development, architecture expertise, technical leadership, and customer-facing communication.
 

You will work with enterprise-grade Java-based solutions, participate in presales and discovery activities, define technical strategies, and guide teams through project launch and early delivery stages.
 

We at Sigma Software create impactful solutions for global Customers and support our engineers with professional growth opportunities, mature engineering culture, and the ability to influence projects from the earliest stages.
 

CUSTOMER

Our Customers operate within Public Sector environment where security, reliability, scalability, and regulatory compliance are critical. The projects focus on building and modernizing enterprise digital services that support mission-critical operations, complex integrations, and long-term maintainability for large-scale organizations.
 

PROJECT

You will join early-stage initiatives where technical leadership plays a key role in transforming business ideas into scalable implementation strategies. The position involves participation in presales activities, tenders, discovery workshops, architecture design, estimation, and project launch support.

The projects include enterprise Java ecosystems, cloud-native infrastructure, distributed systems, secure integrations, and modernization of legacy platforms. You will work closely with Customers, Sales, Delivery, and engineering teams to establish architecture standards and ensure successful project initiation.

Responsibilities:

• Participate in presales activities, discovery sessions, technical workshops, tenders, and RFI/RFP analysis.
• Translate business requirements into scalable technical solutions and implementation strategies.
• Design enterprise-level architectures for Java-based distributed systems and microservices platforms.
• Prepare technical proposals, estimations, architecture diagrams, delivery assumptions, and implementation roadmaps.
• Define technology stack, infrastructure approach, integrations, security principles, and team composition.
• Present and defend technical solutions during Customer discussions and stakeholder meetings.
• Support Sales and Delivery teams during presales and project initiation phases.
• Lead technical project start-up activities and transform high-level concepts into actionable implementation plans.
• Establish architecture standards, engineering guidelines, and development best practices.
• Guide engineering teams during the first delivery stages and support onboarding and technical interviews.
• Conduct architecture and code reviews to ensure scalability, maintainability, and security compliance.
• Resolve complex technical challenges and mentor Senior and Lead Engineers.
• Drive technical decision-making while balancing business goals, delivery timelines, and quality expectations.

Requirements:

• 5+ years of software engineering experience with strong technical leadership responsibilities.
• Strong hands-on expertise in Java ecosystem development.
• Deep knowledge of Spring and Spring Boot.
• Strong understanding of microservices and distributed systems architecture.
• Experience designing and implementing REST APIs and event-driven systems.
• Practical experience with Kafka or similar messaging technologies.
• Experience with relational and NoSQL databases.
• Strong cloud platform experience with AWS, Azure, or GCP.
• Experience with Docker, Kubernetes, CI/CD pipelines, and infrastructure automation.
• Understanding of application security, monitoring, logging, and observability practices.
• Experience working with incomplete or ambiguous requirements and converting them into technical solutions.
• Experience participating in presales, discovery phases, solution proposals, or tender processes.
• Strong estimation and solution design skills.
• Excellent Customer-facing communication and presentation skills.
• Ability to independently drive technical initiatives and take ownership.
• Upper - Intermediate English level.

Приєднуйтесь до Sigma Software на позицію Principal Software Engineer та допомагайте створювати безпечні цифрові платформи великого масштабу для ініціатив у сфері Public Sector. Це стратегічна позиція senior-рівня для досвідченого інженерного лідера, який може поєднувати розробку, архітектурну експертизу, технічне лідерство та комунікацію з клієнтами.
 

Ви працюватимете з enterprise-рішеннями на базі Java, братимете участь у presales та discovery-активностях, визначатимете технічні стратегії та супроводжуватимете команди під час запуску проєктів і на ранніх етапах реалізації.

У Sigma Software ми створюємо значущі рішення для глобальних Клієнтів та підтримуємо наших інженерів можливостями професійного розвитку, зрілою інженерною культурою та можливістю впливати на проєкти з найперших етапів.
 

КЛІЄНТ

Наші Клієнти працюють у сфері Public Sector, де безпека, надійність, масштабованість та відповідність нормативним вимогам мають критичне значення. Проєкти зосереджені на створенні та модернізації enterprise-цифрових сервісів, які підтримують критично важливі операції, складні інтеграції та довгострокову підтримуваність для великих організацій.

ПРОЄКТ

Ви приєднаєтесь до ініціатив на ранніх етапах, де технічне лідерство відіграє ключову роль у перетворенні бізнес-ідей на масштабовані стратегії реалізації. Позиція передбачає участь у presales-активностях, тендерах, discovery-воркшопах, проєктуванні архітектури, оцінюванні та підтримці запуску проєктів.

Проєкти включають enterprise Java-екосистеми, cloud-native інфраструктуру, розподілені системи, безпечні інтеграції та модернізацію legacy-платформ. Ви тісно співпрацюватимете з Клієнтами, Sales, Delivery та інженерними командами для встановлення архітектурних стандартів та забезпечення успішного запуску проєктів.

Обов’язки:

• Брати участь у presales-активностях, discovery-сесіях, технічних воркшопах, тендерах та аналізі RFI/RFP.
• Перетворювати бізнес-вимоги на масштабовані технічні рішення та стратегії реалізації.
• Проєктувати архітектуру enterprise-рівня для розподілених систем та мікросервісних платформ на базі Java.
• Готувати технічні пропозиції, оцінки, архітектурні діаграми, припущення щодо реалізації та дорожні карти.
• Визначати технологічний стек, підхід до інфраструктури, інтеграції, принципи безпеки та склад команди.
• Презентувати та захищати технічні рішення під час обговорень із Клієнтами та зустрічей зі стейкхолдерами.
• Підтримувати Sales та Delivery команди під час presales та етапів запуску проєктів.
• Керувати технічними активностями на старті проєкту та перетворювати високорівневі концепції на практичні плани реалізації.
• Встановлювати архітектурні стандарти, інженерні рекомендації та найкращі практики розробки.
• Керувати інженерними командами на перших етапах реалізації та підтримувати онбординг і технічні інтерв’ю.
• Проводити архітектурні та code review для забезпечення масштабованості, підтримуваності та відповідності вимогам безпеки.
• Вирішувати складні технічні завдання та менторити Senior і Lead Engineers.
• Керувати процесом прийняття технічних рішень, балансуючи бізнес-цілі, терміни реалізації та очікування щодо якості.

Вимоги:

• 5+ років досвіду у software engineering із сильними обов’язками у сфері технічного лідерства.
• Сильна практична експертиза у розробці в Java-екосистемі.
• Глибокі знання Spring та Spring Boot.
• Глибоке розуміння архітектури мікросервісів та розподілених систем.
• Досвід проєктування та реалізації REST API та event-driven систем.
• Практичний досвід роботи з Kafka або аналогічними технологіями обміну повідомленнями.
• Досвід роботи з реляційними та NoSQL базами даних.
• Сильний досвід роботи з хмарними платформами AWS, Azure або GCP.
• Досвід роботи з Docker, Kubernetes, CI/CD pipeline та автоматизацією інфраструктури.
• Розуміння безпеки застосунків, моніторингу, логування та практик observability.
• Досвід роботи з неповними або неоднозначними вимогами та перетворення їх на технічні рішення.
• Досвід участі у presales, discovery-фазах, підготовці solution proposals або тендерних процесах.
• Сильні навички оцінювання та проєктування рішень.
• Відмінні навички комунікації та презентації у взаємодії з Клієнтами.
• Здатність самостійно вести технічні ініціативи та брати на себе відповідальність.
• Рівень англійської — Upper-Intermediate.

AsiaFinance Group is a fast-growing group of fintech companies operating in Asia. Our core business is digital consumer lending.

Position: Java Developer 
Location: Remote (Global)
Reported to: Chief Product Officer

About the Role

As a Middle–Senior Java Developer, you will be responsible for designing, developing, and maintaining backend services that power our lending platforms and internal systems. You will work closely with product, engineering, and infrastructure teams to deliver high-quality software while contributing to architecture decisions, system reliability, and continuous improvement initiatives.

This role is ideal for an experienced developer who enjoys solving complex technical challenges, writing clean and maintainable code, and working in a remote, international environment.

What You'll Do

• Design, develop, and maintain backend applications and services using Java and Spring Framework.
• Build scalable, secure, and high-performance APIs and business services.
• Participate in system design, code reviews, and technical discussions.
• Write clean, maintainable, and well-tested code following software engineering best practices.
• Develop and maintain integrations with internal and external systems.
• Optimize application performance, database queries, and system reliability.
• Implement caching, monitoring, logging, and observability solutions.
• Support production deployments, troubleshooting, and incident resolution.
• Collaborate with Product Managers, QA Engineers, DevOps Engineers, and other developers throughout the software development lifecycle.
• Contribute to technical documentation, architecture improvements, and coding standards.
• Participate in Agile development processes, sprint planning, and retrospectives.
• Continuously improve code quality, development practices, and team efficiency.

What We're Looking For

• Bachelor's degree in Computer Science, Software Engineering, Information Technology, or a related field.
• Strong experience with Java 11+ and Spring Framework (Spring Boot, MVC, Data, Security).
• 4+ years of commercial Java development (Java 11+)
• OOP and SOLID principles — applied daily, not just understood theoretically
• Clean code and refactoring discipline — we improve the codebase, not just add to it
• TDD mindset: unit and integration tests are part of done, not an afterthought
• SQL and relational databases — writing, reviewing, optimising queries and schemas
• REST API integrations — consuming and exposing
• Caching strategies — Redis or equivalent, knowing when and why to apply them
• Data encryption basics — at rest and in transit
• Telemetry and observability — structured logs, metrics, basic alerting
• Git — branching, PR workflow, code review participation
• CI/CD basics — pipeline awareness, build and deploy cycle familiarity
• JVM fundamentals — threading model, memory management basics
• Linux comfort — reading logs, basic shell, deployment tasks

Nice to Have

• Experience with AWS services such as EC2, RDS, S3, and load-balanced environments.
• Familiarity with message brokers, distributed systems, and microservices architecture.
• Experience with monitoring and observability tools such as Grafana, Kibana, or similar platforms.
• Previous experience in fintech, financial services, or high-availability production systems.
• Experience working in distributed international teams.

Why Join Us

• International team with a flat, Western-style corporate culture
• Real ownership across the full BA and QA lifecycle from day one
• Fast career progression in a high-growth, cross-border fintech environment
• Collaborative, energetic team with frequent cross-functional interaction

On behalf of our Client from the US, Mobilunity is looking for a Java Technical Lead

You will work on mission-critical backend systems powering a large-scale US e-commerce platform. The role involves designing and developing backend services, integrations, inventory synchronization, order processing, pricing logic, and marketplace integrations supporting a high-traffic online business.

This is not a typical feature-delivery role. You’ll participate in architectural discussions, solve complex engineering problems, and collaborate directly with technical and business stakeholders to deliver scalable solutions.

Candidates must be available to work primarily during US business hours, with a preferred schedule of 1:00 PM – 8:00 PM CET.

What we’re looking for:

We’re looking for more than a Senior Java Developer.

We need an engineer who enjoys understanding business problems before proposing technical solutions.

You should be comfortable working with open-ended challenges, evaluating trade-offs, asking the right questions, and independently designing scalable backend solutions.

The ideal candidate:

• thinks beyond implementation;
• understands business impact;
• enjoys solving complex engineering problems;
• proactively identifies bottlenecks;
• can justify architectural decisions;
• understands scalability, performance and cost optimization;
• uses AI as an engineering productivity tool while applying independent judgment.

Responsibilities:

• Design, develop and maintain scalable backend services using Java and Spring.
• Build integrations with internal services, marketplaces and external partners.
• Develop REST and SOAP APIs.
• Work on inventory synchronization, pricing, catalog management and order processing.
• Participate in architecture discussions and technical decision-making.
• Troubleshoot production issues.
• Collaborate directly with engineering and business stakeholders.
• Improve system scalability, reliability and performance.
• Contribute to engineering standards and development best practices.

Requirements:

• 7+ years of commercial Java experience.
• Strong Java SE and OOP knowledge.
• Spring Boot, Spring Framework.
• Hibernate/JPA.
• REST APIs.
• SOAP.
• SQL (MySQL or similar).
• Software architecture principles.
• Experience designing scalable backend systems.
• Strong analytical and problem-solving skills.
• Advanced English.

Nice to have:

• SAP Commerce (Hybris)
• AWS
• Docker
• Kafka
• CI/CD
• GraphQL
• Marketplace integrations
• Event-driven architecture
• High-load systems
• Automotive / Retail / E-commerce
• AI-assisted development
• Experience working with US companies

In return we offer:

• The friendliest community of like-minded IT-people
• Open knowledge-sharing environment – exclusive access to a rich pool of colleagues willing to share their endless insights into the broadest variety of modern technologies
• Mobilunity Medical Insurance program designed to attend our teams’ needs
• Paid vacations and sick leaves, including 5 paid days per year that don’t require a sick note
• Perfect office location in the city-center (900m from Lukyanivska metro station with a green and spacious neighborhood) or remote mode engagement: you can choose a convenient one for you, with a possibility to fit together both
• No open-spaces setup – separate rooms for every team’s comfort and multiple lounge and gaming zones
• English classes in 1-to-1 & group modes with elements of gamification
• Neverending fun: sports events, tournaments, music band, multiple affinity groups

Come on board, and let’s grow together!

Level: Senior Engagement: Long-term contract Location: Europe (EU / EEA / UK), remote Working hours: EU business hours, shifted 2–3 hours later to ensure daily overlap with US West Coast (PST/PDT) mornings

About the Client

Our client is a leading enterprise data platform company building an open, high-performance data lakehouse for AI and analytical workloads. The platform combines an intelligent SQL query engine, an AI-ready semantic layer, and an open catalog built on Apache Iceberg — enabling Fortune 500 companies across finance, energy, manufacturing, and logistics to unify, query, and govern data at massive scale across cloud and on-premise sources.

About the Role

We are looking for a Senior Software Engineer to design, build, and own significant components of the core query engine of a large-scale distributed data platform. You will lead work across query planning, optimization, and execution — driving architectural decisions, mentoring middle engineers, and pushing the platform's performance and scalability boundaries across all major clouds.

This is a systems-level, backend engineering role focused on distributed data processing internals — not application development or CRUD services.

Responsibilities

• Architect, design, and implement significant components of the query engine — planner, optimizer, execution operators, memory management, and data access layers.
• Write and review high-quality, performance-critical code in Java and/or C++.
• Own end-to-end delivery of features from technical design through production rollout.
• Drive performance optimization work — profiling, benchmarking, and eliminating bottlenecks in latency- and throughput-sensitive paths.
• Integrate deeply with columnar formats, open table formats, and connectivity drivers.
• Mentor middle engineers, lead code reviews, and set technical standards for the team.
• Contribute to CI/CD architecture and quality processes across Jenkins, containerization, and multi-cloud deployment (GCP, AWS, Azure via Kubernetes / Docker).
• Debug complex, cross-layer issues spanning query planning, distributed execution, memory management, and I/O.
• Partner with US-based engineering leads on design reviews, architectural decisions, and roadmap execution.

Required Qualifications

• Education: B.S. or M.S. in Computer Science, Computer Engineering, or a related technical field.
• Programming: Strong proficiency in Java or C++, with deep understanding of OOP, systems design, memory management, and concurrency. Candidates strong in both are especially valued.
• SQL & Data: Advanced SQL skills and strong understanding of query execution internals — planning, optimization, and operator implementation.
• Data processing systems experience: Demonstrated experience building or extending data processing systems — query engines, distributed databases, ETL/ELT frameworks, or analytical platforms.
• Engineering experience: 5+ years in backend/systems software engineering, with a track record of owning significant components.
• CI/CD & DevOps: Solid experience with Jenkins and modern engineering workflows.
• Containers & Orchestration: Strong working knowledge of Docker and Kubernetes.
• Cloud: Hands-on experience with at least one major cloud (GCP, AWS, or Azure); exposure to more than one is a strong plus.
• Version Control: Confident with Git / GitHub workflows and rigorous code review practices.
• English: Upper-Intermediate or higher (B2+) — daily written and verbal communication with a US-based engineering team.
• Availability: Able to work EU hours with a 2–3 hour shift toward US West Coast time to ensure daily overlap with the client team.
• Leadership: Prior experience mentoring engineers, leading technical designs, or owning components end-to-end.

Desired Skills

• Deep experience with Apache Arrow (columnar in-memory format).
• Hands-on experience with Apache Calcite (SQL parsing, planning, optimization framework).
• Experience with Gandiva or LLVM-based expression compilation and code generation.
• Experience with open table formats — Apache Iceberg, Delta Lake, or Hudi.
• Deep familiarity with distributed computing frameworks (e.g., Apache Spark, Kafka) and MPP SQL query engines (e.g., Presto, Trino, or similar).
• Deep understanding of query planning, optimization (cost-based, rule-based), and execution internals.
• Experience with data connectivity drivers: JDBC, ODBC, Arrow Flight.
• Kubernetes on managed services (GKE / EKS / AKS) and multi-cloud exposure.
• IaC tools such as Terraform.
• Track record of performance optimization at the systems level — profiling, vectorization, cache/memory-conscious design.
• Prior experience contributing to open-source data infrastructure projects.

About Flamingo

Flamingo is revolutionizing the Managed Service Provider (MSP) industry with an AI-driven, open-source platform for IT and security. Our goal is to empower MSPs with automation, optimization, and scalability tools to enhance their operations. 

Role Overview

As a Senior Back-end Engineer (Java) at Flamingo, you will design and develop scalable, high-performance back-end services and APIs using Java and Spring Boot. You will be responsible for implementing event-driven microservices, optimizing system performance, and ensuring high availability as we scale our platform. Your expertise in processing high-volume logs and integrating multiple data sources will be critical to building a robust and efficient system.

Key Responsibilities

• Design and develop scalable backend services and APIs using Java (Spring Boot).
• Architect and implement event-driven microservices with Kafka and RabbitMQ.
• Process and analyze high-volume logs efficiently to ensure scalability and real-time insights.
• Integrate and manage multiple data sources, including SQL, NoSQL, and streaming data.
• Optimize database performance using PostgreSQL, Redis, and Elasticsearch.
• Implement authentication and authorization mechanisms with OAuth, JWT, and Keycloak.
• Collaborate with front-end and DevOps teams to build a seamless and resilient system.
• Ensure code quality through automated testing, CI/CD pipelines, and best engineering practices.

Qualifications

Must-Have:

• 5+ years of experience in backend development with Java and Spring Boot.
• Experience in microservices architecture, including event-driven systems (Kafka, RabbitMQ).
• Strong knowledge of RESTful APIs, GraphQL, and WebSockets.
• Experience processing high-volume logs and working with log management tools (ELK stack, Loki, Fluentd, OpenTelemetry).
• Experience working with multiple data sources, including relational (PostgreSQL) and non-relational (Redis, Elasticsearch) databases
• Experience with containerization (Docker, Kubernetes) and cloud platforms (AWS/GCP).
• Understanding of security best practices in backend development.

Nice-to-Have:

• Experience with functional programming in Java or Scala.
• Familiarity with distributed tracing (e.g., Jaeger, Zipkin) for microservices.
• Knowledge of cloud-native architectures and serverless frameworks.
• Exposure to message queues and event sourcing.

Why Join Flamingo?

• High-impact role: As a back-end engineer, your contributions will directly shape Flamingo’s product and technology.
• Innovative Tech Stack: Work with cutting-edge open-source technologies in AI, automation, and security.
• Remote-first Culture: Flexibility to work from anywhere while collaborating with a top-tier team.
• Mission-Driven Company: Join a team passionate about disrupting the MSP industry and making enterprise-grade security and IT automation accessible to all.

About Us

Smart Capital Center is an end-to-end, AI-powered platform for Commercial Real Estate (CRE) investment and financial management. We power real-time underwriting, asset management, and portfolio analytics through a combination of live data, workflow automation, and AI-driven insights.

Operating at the intersection of Generative AI, finance, and real estate, we are building systems that digitize and simplify complex financial workflows.

Our clients include leading institutions such as JLL, Pacific Life Insurance Company, and KeyBank. We are a lean, high-performance team building category-defining technology in a $17 trillion industry.

To learn more about our platform and vision, please visit our website.

The Role

We are looking for a Backend Software Engineer with strong experience in building scalable systems and a deep interest in AI-powered applications.

This is a high-impact, hands-on role where you will design and build backend services, integrate AI capabilities, and develop intelligent, agent-driven workflows used in real-world production environments.

You will work closely with product, AI, and engineering teams to deliver reliable, high-performance systems and automation features.

What You Will Do

Backend Development

• Design, build, and maintain backend services using Java (Spring Boot) and Python
• Develop scalable APIs and microservices for data-intensive applications
• Optimize system performance, reliability, and scalability
• Design efficient data models and handle complex integrations

AI & Intelligent Systems

• Implement and integrate AI-powered features into core products
• Design and build agent-based workflows for automation and decision-making
• Apply prompt engineering techniques to improve LLM outputs and behavior
• Work with modern AI frameworks to productionize intelligent systems

Cloud & Infrastructure

• Develop and deploy backend systems on AWS (EC2, S3, RDS, Lambda, etc.)
• Build resilient, scalable cloud-native services
• Contribute to system monitoring, logging, and reliability

System Design & Engineering Excellence

• Contribute to architecture, service boundaries, and system design decisions
• Write clean, maintainable, and well-documented code
• Ensure security, performance, and operational stability
• Continuously improve engineering quality and development practices

Collaboration

• Work closely with frontend, product, and AI teams
• Contribute to end-to-end feature delivery
• Participate in Agile development processes

Requirements

• 5+ years of backend software development experience
• Strong experience building and scaling backend systems in production

Core Technical Skills

• Strong experience with Java and Spring Boot
• Solid experience with Python
• Strong knowledge of SQL and database design (PostgreSQL preferred)
• Experience building REST APIs, microservices, and distributed systems
• Hands-on experience with AWS (EC2, S3, RDS, Lambda, etc.)
• Proficiency with Git and modern development workflows

AI & Modern Development Experience

• Experience with prompt engineering for LLM-based systems
• Practical experience building AI agent workflows in production
• Familiarity with frameworks/tools such as:
  • LangGraph
  • LangChain
  • LangSmith
  • or similar ecosystems
• Experience using AI-assisted development tools, such as:
  • Claude Code
  • Codex
  • OpenCode
  • or similar

Nice to Have

• Experience with vector databases or semantic search (e.g., Milvus)
• Knowledge of RAG (Retrieval-Augmented Generation) architectures
• Experience with CI/CD pipelines and DevOps practices
• Familiarity with event-driven architecture

• Experience with data processing pipelines or document AI systems

   

Why Join Us

• Work on cutting-edge AI-powered systems in a $17T industry
• Build real-world applications using LLMs, agents, and automation
• High ownership and autonomy with meaningful technical impact
• Opportunity to influence system design and engineering direction
• Fast-moving, execution-focused team with minimal bureaucracy
• Competitive compensation and flexible work environment